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2/27/2004 Management Considerations for Group I 1. Reduce or eliminate exploitation on depressed and /or very small populations in Lake Huron and Ontario and institute monitoring of age and size structure. 2. Implement surveys of known spawning populations including development of strategies for monitoring spawning populations. Surveys should be spatially broad, temporally correct and account for gear saturation. 3. If alewives are viewed as detrimental to herring restoration, a strategy to eliminate alewives through increased stocking of salmonines or fishery harvest should be considered. Such actions would benefit herring, reduce a known cause of a thiamine deficiency and associated effects, and reduce a species implicated in the demise of many indigenous species. Moreover alewives may not persist through time. 32
2/27/2004 Appendix E Summary of Discussion Group II Participants: Tom Todd (group leader), Jim Peck (rapporteur), Dave Fielder, Dale Honeyfield, Jim Hoyle, Lloyd Mohr, Kevin Pangle, Phil Ryan, Don Schreiner, Kim Scribener Impediment Matrix Impediments: Superior Huron Michigan Erie Ontario a. Habitat Degradation a.a. spawning 1 2 2 3 1 a.a. egg incubation 1 2 2 3 1 a.b. juvenile 1 I I I I a.c. adult 1 I I I I b. Contaminants 2 3 5 4 5 c. Exploitation a. commercial-i. direct 3 3 2 1 1 a. commercial-ii. bycatch 1 1 1 2 2 b. recreational 1 2 1 1 1 d. Non-native biota a. fish, i. piscivores 3 5 5 5 5 a. fish, ii. planktivores 1 5 5 1 5 a. fish, iii. benthivores 1 5 5 1 5 a. fish, iv parasites 3 5 5 1 5 b. invert., i. zooplankton 2 3 3 1 5 b. invert., ii. dreissenids 1 3 3 3 5 c. birds i. cormorants 1 3 3 4 4 e. Native biota i. piscivores 2 3 3 4 4 ii. plantivores 1 1 1 1 1 iii. benthivores 2 3 3 1 1 iv. invertebrates 1 3 3 4 4 f. Genetics a. hybridization 1 2 5 5 3 b. diversity 1 2 5 5 5 g. Stock structure a. age 2 2 I I I b. sex-ratio 2 1 I I I h. Spawning stock a. magnitude/size 2 4 5 5 4 b. spawning site fidelity I I I I I i. Climate 1 3 3 5 5 33
Page 1 and 2: GREAT LAKES FISHERY COMMISSION 2004
Page 3 and 4: Status and Assessment, Research, an
Page 5 and 6: Executive Summary The Great Lakes R
Page 7 and 8: Introduction The lake herring (Core
Page 9 and 10: Table 1: Potential Impediments to L
Page 11 and 12: Based on index netting, lake herrin
Page 13 and 14: Table 1: Summary of impediment rank
Page 15 and 16: Summary of Knowledge Gaps for Lake
Page 17 and 18: Figure 3: Summary of knowledge gaps
Page 19 and 20: 2/27/2004 Alewives and to a lesser
Page 21 and 22: 2/27/2004 Summary of Restoration Ne
Page 23 and 24: 2/27/2004 References Bence, J. R. a
Page 25 and 26: 2/27/2004 Appendix A Agenda Lake He
Page 27 and 28: 2/27/2004 Appendix B Participant Li
Page 29 and 30: 2/27/2004 Appendix C Summary of Sta
Page 31 and 32: 2/27/2004 Explanatory notes for imp
Page 33: 2/27/2004 Research Questions for Gr
Page 37 and 38: 2/27/2004 e. Native biota • Pisci
Page 39 and 40: 2/27/2004 Final Charge 2 for Group
Page 41 and 42: 2/27/2004 Explanatory notes for Gro
Page 43 and 44: 2/27/2004 Final Charge 1 for Group
Page 45 and 46: 2/27/2004 Issue: What are the early

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